Feature: Provide interpolation factor

In order to interpolate and predict We will calculate an interpolation factor So that micro details will have better accuracy

Scenario: Interpolation factor is in range [0, 1)
Given a default gameclock
When the interpolation factor is calculated
Then the interpolation factor will be in the range 0 to 1 exclusive

Scenario: Real time is not evenly divisible by update interval
Given a default gameclock
When real time is not evenly divisible by update interval
Then the interpolation factor will be directly proportional to the point in time between the last update and the next update

